( cxlix ) 



angle of the clasp lies the trough of the sedoeagus, this being 

 a broad deeply hollowed plate ; the sedoeagus is short, straight, 

 moderate in width, tapering evenly but slightly to the orifice ; 

 the vesica is simple with very little armature. Time and 

 space will, I fear, only admit of one more instance in this 

 group. 



Ichthyura pigra, Hiifn. 



The cingula and the harpagones appear to be one continuous 

 plate, the former quite narrow up to the articulation in the 

 tergite, which is marked, the latter consisting of a peculiar 

 almost fan-like structure, the folds (as it were of the fan) being 

 exceedingly numerous, irregular and waved, with a dentate 

 outer edge ; in addition to this the clasp has a rearward 

 squarish process quite independent of the girdle, which 

 ascends to the upper edge of the fan, being completely excised 

 in the middle, where it terminates in a finely wedge-shaped 

 outline ; the tegumen consists of a moderate hood with a 

 bifurcate apex terminating in two small spikes, below these 

 lie two curved horn-like sclerites with a wedge-shaped lobe 

 attached to their lower margins — the anus protrudes below 

 these ; the sedoeagus is a curved tube of moderate size, with 

 the vesica heavily shagreened and very finely tubercled. 



In many of the Lymantriadae the harpagones are sharply 

 divided into two sections, the lower one occupying the hori- 

 zontal position as is usual among the higher families, the upper 

 section often rising at a very considerable angle, similar to some 

 of the Psychidae and Heterogynidae; this combination is 

 interesting and is very marked in some species of the genus 

 Euproctis. The cingula and saccus show extraordinarily 

 varying degrees of development, in some genera they are 

 absent for all practical purposes, in others they are large and 

 prominent, with the saccus very long, whilst in the simplest 

 forms the saccus, cingula and tegumen form the continuous 

 collar so well known in some of the dominant genera of the 

 Rhopalocera. We thus have, as is sure to be the case in a 

 large and world-wide family, some evidences of ancient origin, 

 but on the whole the evidence shows decided progress in 

 development. ' 



